Shalom and Hag Sameach!
My parents live in other country, I sent to them mishloach manot but it’s arrived couple of days before Purim – performance of obligation is binding in this case or I have to distribute mishloach manot exactly on 14,15 adar?
If your parents received the mishloach manos before the 14th, you will not fulfill the mitzvah with this mishoach manos, unless a stipulation is made whereby the food must not be eaten until Purim.
See Kaf Ha-Chaim 694:16; Eishel Avraham (Butshatch) 694; Divrei Yatziv Vol. 2, no. 298, sec. 3.